title: Ultrafast nonlinear optical spectroscopy of a dual-band negative index metamaterial all-optical switching device.
abstract: We study the nonlinear optical response of a fishnet structure-metamaterial all-optical switching device that exhibits two near-infrared negative-index resonances. We study and compare the nonlinear optical response at both resonances and identify transient spectral features associated with the negative index resonance. We see a significantly stronger response at the longer wavelength resonance, but identical temporal dynamics at both resonances, providing insight into separately engineering the switching time and switching ratio of such a fishnet structure metamaterial all-optical switch. We also numerically reproduce the nonlinear behavior of our device using the Drude conductivity model and a finite integration technique over wide spectral and pump fluence ranges. Thereby, we show that beyond the linear properties of the device, the magnitude of the pump-probe response is completely described by only two material parameters. These results provide insight into engineering various aspects of the nonlinear response of fishnet structure metamaterials.
authors.affiliation: Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
authors.forename: Keshav M
authors.initials: KM
authors.lastname: Dani
authors.forename: Zahyun
authors.initials: Z
authors.lastname: Ku
authors.forename: Prashanth C
authors.initials: PC
authors.lastname: Upadhya
authors.forename: Rohit P
authors.initials: RP
authors.lastname: Prasankumar
authors.forename: Antoinette J
authors.initials: AJ
authors.lastname: Taylor
authors.forename: S R J
authors.initials: SR
authors.lastname: Brueck
mesh_terms: D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008962:Models, Theoretical; D017711:Nonlinear Dynamics; D055096:Optical Devices; D012031:Refractometry / Q000295:instrumentation*; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D013057:Spectrum Analysis / Q000295:instrumentation*